Chair frame



FIG. 1 is a left side elevational view of a chair frame showing my new design, the right side being a mirror image,

FIG. 2 is a front elevational view thereof,

FIG. 3 is a rear elevational view thereof; and,

FIG. 4 is a perspective view thereof.

The chair upholstery in above figures is shown in broken lines for illustrative purposes only and forms no part of the claimed design. 

The ornamental design for a chair frame, as shown and described. 